Cleaning attachment for furnace-grates.



- PATENTBD AUG. 20 P. GIRTANNE'B & G. NILL. CLEANING ATTACHMENT FOR FURNACE GRATES.

APPLICATION FILED 001, 20. 1906.

"116.863914. I PATENTED AUG.20,1907.

- R'GIRTANNER & o. NILL.

CLEANING ATTACHMENT FOR FURNACE GRATBS. nrmonron rmzn our. 20. 1906.

2 SHEETS-SHEET 2.

Mayo

FREDERICK GIRTANNER AND CONRAD NILE, OF ERIE, PENNSYLVANIA.

CLEANING ATTACHMENT FOR FURNACE-GRATES.

To all it may concemi Be it knownthatwe, FREnERroK GrR ANNER and Corn ran NILL, citizens of the United States, residing at Erie, in the county'of Erie and State of Pennsylvania, have invented certain new and useful Improyements in Cleaning Attachments fo'i' Furnace Grates, of which the following is a specification.

In the type of traveling grates or furnaces as generally constructed, a side opening is required at the rear of the grate for removal of clinkers and other ac' cumulations, thereby preventing the employment of such grates in a battery of furnaces.

The present invention wholly obviates the side door and supplies the grate with an automatic cleaning and clinker breaking attachment.

The invention combines with the grate a dumping section in the rear thereof adjacent to the bridge wall, whereby ashes, clinkers and the like maybe instantly and conveniently discharged, and a cleaning device which is interposed between said dumping section and the grate, thereby preventing choking of the grate and enabling a clear fire to be maintained.

For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction of the means for efiecting the result, reference is to be had to thefollowing description and accompanying drawings. i

While the invention may be adapted to different forms and conditions by, changes in the structure and minor details withoutdeparting from the spirit or essential features thereof, still the preferred embodiment is shown in the accompanying drawings, in which:

Figure l is a longitudinal section of a furnace grate embodying .the invention, showing a portion of the bridge wall and boiler. Fig. 2 is a top planview of the grate. Fig. 3 is an end view of the crushing roller. Fig. 4 is a side elevation of the crushing roller. Fig. -5 is a detail view, showing the mountings for the inner end of the main grate, the supplemental duniping grate being omitted. Fig. 6 is a'view of the parts shown in Fig. 5 with the addition of the supplemental dumping grate. i l I,

Corresponding and like parts are referred to in the following description and indicated in all-the views of he drawings by the same reference characters.

' The grate 1 is of the traveling or movable type so as .20 gradually and continuously advance the fuel from front torear so as to prevent the giving off of free carbon and to utilize practically all the heat units derived from the fuel.

Thegrate illustrated is of the chain type and is supported at its ends upon rollers '2 a nd 3, the up oer portion of the grate being arranged to move from front to rearand the grate is moved in the present instance by sprocket wheel 2*,on the shaft of the front roller 2.

Specification of Letters Patent. Application filed October 20,1906. Serial No. 839,829.

PatentedAugj 20, 1907.

The grate is mounted upon a frame-4 which in turn is supplied with rollers 5 arranged to travel upon a track' or rest 6, whereby the grate may be removed when desired to admit of repairs being readily and conveniently made or for any desired purpose.

In the rear of the movable or traveling grate 1 is arranged a dumping grate 7 adapted to be operated from any convenient point by means of rods or connections 8. The dumping grate 7 is located adjacent to the bridge wall 9 and is in a lower plane than the main grate 1 so as to receive cinders, coke or other matter discharged therefrom and not eliminated-by the interposed clearing means.

The automatic cleaning and clinker breaking device arranged intermediate of the main anddumping grates comprises rollers 11 and 12 disposed' in parallel relation and located one in advance of and in a higher plane than the other, said rollers being preferably corrugated, .finted or ribbed so as -to make positive engagement with -the clinkers to crush and break the same and efiect positive discharge thereof between the said rollers. The rollers 11 and 12 are mounted I I upon shafts 13 and 14, the shaft '13 being angular and the shaft 14 round. The rollers 11 and 12 are composed of a plurality of sections which are loosely mounted upon their respective shafts and are arranged to break joint, as indicated most clearly in Fig. 2. The sections or members comprising the roller 12 are loose upon the shaft 14 so as to turn freely and independently thereon, whereas the sections or members of the roller 11 are slipped upon the shaft 13 and mounted so as to turn therewith. Motion is imparted to the shaft 13 and the sections of the roller turned therewith by reason of their mounting or connection. A sprocket wheel 15 is fast to the outer end of the shaft 13'a1'1d' is.

connected by sprocket chain 16 with a sprocket wheel 17 fast to the shaft 18 of the outer or front roller 2. The

sprocket wheel 15 is of less diameter than the sprocketv wheel 17, hence while the roller 2 turns'slowly the shaft 13 has imparted thereto a faster speed, with the result that clinkers caught between the rollers 11 and 12 are crushed anddischarged between the rollers into the ash pit. Coke and fuel of a size not to be acted upon by the cleaning device pass by the same and are received upon the dump grate and consumed. The sections or small rollers comprising the respective rollers '11 and 12 are preferably hollow and the ends of supporting portions have notches 19 surroundingthe; openings to provide for a free circulation of air, whereby .the rollers and their supporting shafts are kept cool and prevented from overheating.

The fuel is supplied to the front portion of the grate and is gradually advanced thereby into the combustion chamber, the gases being evolved and consumed. The clinkers clearing-the year end of the grate are caught by the positively driven roller 11 and I carried rearward and-downward and are crushed in their passage between the rollers ll and 12.

In the event of it being required, for any cause, to force the furnace, the main grate may be driven at a higher rate of speed in order to throw more fuel upon the dumping grate "7, thereby increasing the fuel surface. Ashes and other accumulations upon the grate 7 may be removed fromtime to time by operating the rod 8se asto effect a dumping of thesection or grate, whereby the ashes and other matter supported therebymay be discharged into the ash 'pit. I

In order to prevent bending or other injury to the main grate and the rollers 11 and 12 by a hard substance passing between them, it is preferred to. mount the roller 12 so as to,yield or move away from the roller 11 when a hard clinker or other yielding object comes between the crushing rollers. As indicated, the shafts 13 and 14 of the crushing rollers are mounted in open bearings formed at or near'the rear ends of the side pieces of the grate rest, said bearings consisting of slots 22 and 23. The slots 22 and 23 extend inward from the top edge of the side pieces of the grate rest and are upwardly and rearwardly inclined, thereby preventing casual displacement of the crushing rollers. In the. event of a hard clinker or other object not readily crushed passing between the rollers 11 and 12, the latter willmove away from the roller 11 and admit of the object passing between the two rollers without exerting unusual strain, such as would cause the rollers either to bend or to break. In order to reset the roller 12, that is, to return it to normal position after being moved rearward by a non-crushable object, rods 24 have connection at their rear ends 'with the terminal portions of the shaft 14 and their outer ends project through the front of the furnace so as to be readily accessible and at all times under observation. Collars 25 are slipped upon the ends of the shaft 14 and the rear ends of the rods 24 are connected to lugs pendent therefrom. So long as the rollers 11 and 12 remain in relative normal position, the outer ends of the rods 24 occupy a predetermined position, but when the roller 12 is disturbed or moved rearward, the same may be known by observing the changed position of the projecting ends of the rods 24, thereby affording the fireman or other attendant an opportunity to return said roller to normal position by drawing upon the outer ends of the rods 24. The roller 12 may be returned automatically to normal position and for this purpose elbow levers 26 may be fulcrumed to the front portion of the furnace and one Having thus described the invention, what is claimed as new is: 1

1. In combination with a furnace grate, means for removing ashes, clinkers and the like, the same comprising an angular shaft at the end of the grate, a series of roller sections mounted upon said shaft to rotate therewith means for turning said shaft, 21 round shaft, and a series of roller sections loosely mounted upon the round shaft and adapted to have independent rotary movement thereon.

2. In combination with a furnace grate, means for removing ashes, clinkers, and the Like, the same comprising coiiperating rollers at the rear of the grate, shafts on which said rollers are mounted the rollers being loose on one of said shafts, the shaft nearest to the end of the grate being angular and the roller thereof being mounted to rotate therewith, means for turning said shaft, a dump-.

- ing grate at the rear of said rollers, and means for dumping the last named grate.

3. The combination with a traveling furnace grate emhodying rollers 'on which the grate proper is mounted to travel, means for turning one of said rollers whereby.

to effect the movement of the grate, coiiperating rotary crushing members formed of a series of rollers and located at the rear of the traveling grate, shafts on which said series of rollers are mounted, one of said series of rollers being revoluble with its shaft, and the other series being loose on its shaft, and a connection between the first named shaft and the traveling grate and adapted to turn such shaft, as and for the purpose set forth.

4. In combination with, a traveling grate embodying a front and rear rollers arid shafts therefor, the front shaft being provided with .a sprocket wheel, two transverse shafts at the rear end of the grate, rollers mounted on each of said shafts, the rollers on one of said shafts being loose thereon and the rollers on thegother shaft being movable with the shaft, a sprocket wheel on said last named shaft, and n sprocket chain connection between said'sp'rocket wheels.

5. A furnace grate, comprising a frame, a traveling grate mounted in said frame, said frame being provided at the rear end of the traveling grate with hearing recesses, shafts mounted in said recesses, an operative connection between one of said shafts and the traveling grate, whereby they will move together, a series of roller sections on the shafts at the rear end of the grate, one series of sections being movable with its shaft and the other loose E. L. WHrr'rnKnR, ROBERT L, ROBERTS. 

